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Some aspects of Morris-Thorne wormhole in f(Q,T) gravity f(Q,T)引力下莫里斯-索恩虫洞的某些方面
Europhysics Letters Pub Date : 2024-03-25 DOI: 10.1209/0295-5075/ad3777
Chaitra Chooda Chalavadi, V. Venkatesha
{"title":"Some aspects of Morris-Thorne wormhole in f(Q,T) gravity","authors":"Chaitra Chooda Chalavadi, V. Venkatesha","doi":"10.1209/0295-5075/ad3777","DOIUrl":"https://doi.org/10.1209/0295-5075/ad3777","url":null,"abstract":"\u0000 The aim of this manuscript is to study traversable wormhole geometries in the non-metricity and matter coupling gravity. We investigate the Morris-Thorne wormhole metric within the framework of extended symmetric teleparallel gravity. With an anisotropic matter distribution, we explore two distinct wormhole models under two different scenarios. First, we consider the equations of state, and then we assume specific shape functions for each scenario. In both cases, the shape function satisfies all fundamental criteria for a traversable wormhole. We present our results through graphical representations and analyze the energy conditions. Furthermore, we examine the behavior of the wormhole through the anisotropic parameter. Finally, we present our conclusions based on the obtained results.","PeriodicalId":503117,"journal":{"name":"Europhysics Letters","volume":" 40","pages":""},"PeriodicalIF":0.0,"publicationDate":"2024-03-25","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"140383622","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 0
Multifactorial effects on bounded rational decision-making 多因素对有界理性决策的影响
Europhysics Letters Pub Date : 2024-03-19 DOI: 10.1209/0295-5075/ad3574
Dun Han, Xiang Li
{"title":"Multifactorial effects on bounded rational decision-making","authors":"Dun Han, Xiang Li","doi":"10.1209/0295-5075/ad3574","DOIUrl":"https://doi.org/10.1209/0295-5075/ad3574","url":null,"abstract":"\u0000 Conventional models of decision-making are predicated upon the notion of rational deliberation. However, empirical evidence has increasingly highlighted the pervasive role of bounded rationality in shaping decisional outcomes. The manifestation of bounded rationality is evident through a spectrum of cognitive biases and heuristics, including but not limited to anchoring, availability, the decoy effect, herd behavior, and the nuanced dynamics of reward and punishment, as well as the implications of weighting and framing effects. This prospective study is dedicated to a comprehensive exploration of such multiple factors together with their impacts to the architecture and functionality of decision-making processes, and their further research potentials as well.","PeriodicalId":503117,"journal":{"name":"Europhysics Letters","volume":"16 3‐4","pages":""},"PeriodicalIF":0.0,"publicationDate":"2024-03-19","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"140228393","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 0
Controlled circular dichroism with graphene-based metamaterial for terahertz wave 利用石墨烯基超材料控制太赫兹波的圆二色性
Europhysics Letters Pub Date : 2024-03-19 DOI: 10.1209/0295-5075/ad3575
Abdul Jalal, Muhammad Qasim, U. Qureshi, Bin Hu
{"title":"Controlled circular dichroism with graphene-based metamaterial for terahertz wave","authors":"Abdul Jalal, Muhammad Qasim, U. Qureshi, Bin Hu","doi":"10.1209/0295-5075/ad3575","DOIUrl":"https://doi.org/10.1209/0295-5075/ad3575","url":null,"abstract":"\u0000 This article explores the design and analysis of a metal-graphene hybrid metamaterial structure tailored for tunable circular dichroism (CD) effects in the terahertz (THz) frequency regime. Chiral metamaterials have garnered considerable interest in photonics due to their versatile applications, including sensing, polarization manipulation, and chiral imaging. The proposed metamaterial unit cell features four meta-atoms with C4 rotational symmetry, composed of gold on a polyimide substrate. By strategically integrating the graphene sheets above the gold patterns, selective control over the absorption efficiency for the incident wave of left-handed circularly polarized (LCP) and right-handed circularly polarized (RCP) light is achieved. The study demonstrates that adjusting graphene chemical potential enables precise modulation of CD from 0.80 to 0.10 across a wide THz frequency spectrum. Furthermore, the article investigates the structure optical response for incident angles ranging up to 750, revealing stable CD behavior up to 300 and intriguing dual-band effects beyond 500. These findings underscore the potential of the proposed metamaterial for practical applications in photonics, sensing, and chiral imaging, offering tunable control over the CD effects in the THz regime.","PeriodicalId":503117,"journal":{"name":"Europhysics Letters","volume":"59 7","pages":""},"PeriodicalIF":0.0,"publicationDate":"2024-03-19","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"140230558","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 0
The effect of nonlinear diffusive coupling on the synchronization of coupled oscillators 非线性扩散耦合对耦合振荡器同步化的影响
Europhysics Letters Pub Date : 2024-03-14 DOI: 10.1209/0295-5075/ad33e7
Negar Massihi, Fatemeh Parastesh, Farzad Towhidkhah, Huihai Wang, Shaobo He, S. Jafari
{"title":"The effect of nonlinear diffusive coupling on the synchronization of coupled oscillators","authors":"Negar Massihi, Fatemeh Parastesh, Farzad Towhidkhah, Huihai Wang, Shaobo He, S. Jafari","doi":"10.1209/0295-5075/ad33e7","DOIUrl":"https://doi.org/10.1209/0295-5075/ad33e7","url":null,"abstract":"\u0000 This paper examines the impact of nonlinear coupling on the synchronization of interconnected oscillators. Various powers of diffusive coupling are explored to introduce nonlinear effects, and the results are contrasted with those of linear diffusive coupling. The study employs three representative chaoic systems—namely, the Lorenz, R¨ossler, and Hindmarsh-Rose systems. Findings indicate that nonlinear couplings with power below one result in synchronization at lower coupling strengths. Additionally, the critical coupling strength reduces as the coupling power decreases. However, the synchronization region undergoes changes and becomes bounded. Conversely, for powers exceeding one, networks are either unable to synchronize or require higher coupling strengths compared to linear coupling.","PeriodicalId":503117,"journal":{"name":"Europhysics Letters","volume":"8 6","pages":""},"PeriodicalIF":0.0,"publicationDate":"2024-03-14","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"140243393","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 0
Information-response inequality in the small noise limit 小噪声极限下的信息-反应不等式
Europhysics Letters Pub Date : 2024-03-14 DOI: 10.1209/0295-5075/ad33e6
Andrea Auconi
{"title":"Information-response inequality in the small noise limit","authors":"Andrea Auconi","doi":"10.1209/0295-5075/ad33e6","DOIUrl":"https://doi.org/10.1209/0295-5075/ad33e6","url":null,"abstract":"\u0000 The invariant response was defined from a formulation of the fluctuation-response theorem in the space of probability distributions. An inequality which sets the mutual information as a limiting factor to the invariant response is here derived in the small noise limit based on Stam’s isoperimetric inequality. Beyond the small noise limit, numerical violations exclude its general validity, however a strong distribution bias is observed. Applications to the thermodynamics of feedback control and to estimation theory are discussed.","PeriodicalId":503117,"journal":{"name":"Europhysics Letters","volume":"84 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2024-03-14","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"140242359","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 0
Advanced progress of network resilience 网络复原力的先进进展
Europhysics Letters Pub Date : 2024-03-13 DOI: 10.1209/0295-5075/ad3362
Min Liu, Qiang Guo, Jianguo Liu
{"title":"Advanced progress of network resilience","authors":"Min Liu, Qiang Guo, Jianguo Liu","doi":"10.1209/0295-5075/ad3362","DOIUrl":"https://doi.org/10.1209/0295-5075/ad3362","url":null,"abstract":"\u0000 Network resilience measures complex systems ability to adjust its activity to retain the basic functionality for systematic errors or failures, which has attracted increasingly attentions from various fields. Resilience analyses play an important role for early warning, prediction, and proposing potential strategies or designing optimal resilience systems. This Letter reviews the advanced progress of network resilience from three aspects: Resilience measurement, resilience analysis, as well as resilience recovery strategies. We outline the challenges of network resilience which should be investigated in the future.","PeriodicalId":503117,"journal":{"name":"Europhysics Letters","volume":"20 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2024-03-13","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"140245321","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 0
Probing baryogenesis in f(Q) gravity 探究 f（Q）引力中的重子发生机制
Europhysics Letters Pub Date : 2024-03-11 DOI: 10.1209/0295-5075/ad329b
Sai Swagat Mishra, Aaqid Bhat, P. Sahoo
{"title":"Probing baryogenesis in f(Q) gravity","authors":"Sai Swagat Mishra, Aaqid Bhat, P. Sahoo","doi":"10.1209/0295-5075/ad329b","DOIUrl":"https://doi.org/10.1209/0295-5075/ad329b","url":null,"abstract":"\u0000 The origin of matter domination in the Universe is one of the most exciting open puzzles in particle physics and cosmology. Despite many theoretical developments, the actual reason behind baryon-antibaryon asymmetry is still unknown. Our aim here is to examine this phenomenon in the framework of modified gravity theories, which have impressively elucidated the contemporary accelerated expansion of the universe as well as the early phase. Consequently, this letter sets its sights on the task of constraining a specific variant of modified gravity, namely, $f(Q)$ gravity, in conjunction with gravitational baryogenesis. The Power Law model and recently proposed DGP-like $f(Q)$ models are considered to find the baryon-to-entropy ratio and compare them with the observed value, that is ${n_B}/s=9.42times 10^{-11}$. Furthermore, we impose constraints on the additional degrees of freedom introduced by this modified theory of gravity.","PeriodicalId":503117,"journal":{"name":"Europhysics Letters","volume":"88 3","pages":""},"PeriodicalIF":0.0,"publicationDate":"2024-03-11","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"140251792","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 0
Increase in the count rates of ground-based cosmic-ray detectors caused by the heliomagnetic disturbance on 5 November 2023 2023 年 11 月 5 日日冕扰动导致地基宇宙射线探测器计数率增加
Europhysics Letters Pub Date : 2024-03-11 DOI: 10.1209/0295-5075/ad329c
A. Chilingarian, T. Karapetyan, B. Sargsyan, M. Zazyan, Johannes Knapp, Michael Walter, T. Rehm
{"title":"Increase in the count rates of ground-based cosmic-ray detectors caused by the heliomagnetic disturbance on 5 November 2023","authors":"A. Chilingarian, T. Karapetyan, B. Sargsyan, M. Zazyan, Johannes Knapp, Michael Walter, T. Rehm","doi":"10.1209/0295-5075/ad329c","DOIUrl":"https://doi.org/10.1209/0295-5075/ad329c","url":null,"abstract":"\u0000 This letter presents a rare physical phenomenon associated with solar activity, manifesting in anomalies within neutron, electron, and gamma-ray fluxes in the atmosphere. Conventionally, Earth's magnetic field disturbances reduce cosmic ray intensity reaching the surface. However, a temporary surge in cosmic ray flux occurs intermittently known as the Magnetospheric Effect (ME). Our observations reveal that this effect predominantly induces a count rate increase in particle detectors positioned at middle latitudes on mountaintops. On November 5, 2023, a 2-3% increase in neutron monitors at mountain altitudes and up to 5% increase in thin plastic scintillators registering electrons and gamma rays. This flux escalation coincided with a southward orientation of the interplanetary magnetic field. Importantly, we present, for the first time, the energy spectrum of the Magnetospheric Effect observed at two mountaintops: Aragats and Zugspitze. Simulations of low-energy proton interactions in the terrestrial atmosphere affirm the augmentation of low-energy cosmic rays. Protons, typically restricted by the geomagnetic cutoff, reached the Earth's atmosphere, generating detectable particle showers on the Earth's surface.","PeriodicalId":503117,"journal":{"name":"Europhysics Letters","volume":"12 4","pages":""},"PeriodicalIF":0.0,"publicationDate":"2024-03-11","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"140253654","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 0
The impact of preferential selection mechanism based on average payoff and stability of payoff on the evolution of cooperation 基于平均报酬和报酬稳定性的优先选择机制对合作演化的影响
Europhysics Letters Pub Date : 2024-03-07 DOI: 10.1209/0295-5075/ad3188
Pengcheng Li, Tianbo Ye, Suohai Fan
{"title":"The impact of preferential selection mechanism based on average payoff and stability of payoff on the evolution of cooperation","authors":"Pengcheng Li, Tianbo Ye, Suohai Fan","doi":"10.1209/0295-5075/ad3188","DOIUrl":"https://doi.org/10.1209/0295-5075/ad3188","url":null,"abstract":"\u0000 Recent studies on memory-based cooperative evolution have focused on random selection of learning objects and only considered average payoff, neglecting stability of payoff. Here, we propose a preference selection mechanism adopting the TOPSIS method, a multi-attribute decision-making approach. We introduce the weighting factors ω1 and ω2, which refer to average payoff and stability of payoff, respectively. The probability that an individual select his neighbor is influenced by both average payoff and stability. We investigate the effect of memory length M and ω1 on the evolution of cooperation. The simulation results indicate that M and ω1 can both somewhat promote cooperation. Given that ω1 = ω2 = 0.5, for small betrayal temptation b, cooperation is more robust for small M, while for large b, large values of M are preferred. Further exploring the impact of ω1, for relatively small b, the influence of ω1 on cooperation is gradually revealed and strengthened as M increases. Conversely, for relatively large b, the impact of ω1 on cooperation slowly diminishes from strong as M increase, reflecting a gradual rise in the importance of stability. These findings enhance understanding of cooperative behavior in real social environments and make more rational decisions under the multi-factor evaluation based on average payoff and stability.","PeriodicalId":503117,"journal":{"name":"Europhysics Letters","volume":"41 9","pages":""},"PeriodicalIF":0.0,"publicationDate":"2024-03-07","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"140260363","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 0
Quantum walk of two non-interacting particles on a 2D lattice 二维晶格上两个非相互作用粒子的量子行走
Europhysics Letters Pub Date : 2024-03-05 DOI: 10.1209/0295-5075/ad3052
Qi Han, Ning Bai, Shuai Wang, Lijie Gou, Rong Zhang
{"title":"Quantum walk of two non-interacting particles on a 2D lattice","authors":"Qi Han, Ning Bai, Shuai Wang, Lijie Gou, Rong Zhang","doi":"10.1209/0295-5075/ad3052","DOIUrl":"https://doi.org/10.1209/0295-5075/ad3052","url":null,"abstract":"\u0000 In this letter, it is sufficient to simply tensor the single-particle unitary operator U1 for the evolution operator U2 of two-particle that do not have interactions. Subsequently, the operator U1is diagonalized and the relative distance between two non-interacting particles on the 2D lattice at the moment t is obtained using the distance evolution operator.","PeriodicalId":503117,"journal":{"name":"Europhysics Letters","volume":"5 4","pages":""},"PeriodicalIF":0.0,"publicationDate":"2024-03-05","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"140263185","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 0
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